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Author Topic: Go Faster Bit for Murena 2.2  (Read 1331 times)
Matra_Hans
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Posts: 642


Owner of Bagheera, Rancho, Murena & Espace


« on: June 04, 2014, 09:41:14 am »

Cam shaft grinded as "Maxi Group 4" with with a lift of  8.75 mm
http://www.leboncoin.fr/equipement_auto/668900201.htm?ca=17_s
and
a set of 2dellorto carburetors
http://www.leboncoin.fr/equipement_auto/666847336.htm?ca=17_s
« Last Edit: June 04, 2014, 09:44:36 am by Matra_Hans » Logged
roy4matra
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Posts: 873



« Reply #1 on: June 04, 2014, 04:46:41 pm »

Cam shaft grinded as "Maxi Group 4" with with a lift of  8.75 mm

I notice there is no mention of the rocker arms in the advert.  You must never fit a different cam with existing rocker arms without the pads being resurfaced.  If you were using the rockers arms that have already been run with this cam, they must stay in the same positions too.  Cam lobes and rocker arm pads bed to one another and should be kept together.  Cam lobes will wear out rapidly if used with rocker arms from a different cam, or arms not resurfaced.

8.75mm cam lift means over 12 mm valve lift as the rocker arm ratio is 1.38:1.  With this much valve lift you will also need to modify the valve spring arrangement.  The standard single coil valve springs will coil bind with this much lift, so you will need a twin valve springs set-up with thinner coils, which means new collars to seat them all.  So on top of the 700 Euro being asked for the cam (and hopefully matching rocker arms), you will need quite a bit more doing before you can use it.

Roy
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